Originally Posted by
ksandness
One thing I have said repeatedly on this site is that Mount Fuji probably won't be visible at the time of year you're going. If it is visible, you will be able to see it from tall buildings in Tokyo. If Fuji isn't visible from Tokyo, you won't be able to see it even if you're practically on its slopes.
Even though you have spent much more time in Tokyo, I dare to disagree on this. It's been at least two times in weather that seemed perfectly clear and I went to some sightseeing spot in Tokyo and tried to see Fuji and I could only make a very faint outline. That 70-80 kilometers of atmosphere in between does make difference. If I've understood correctly the visibility is best in winter months when there is less moisture in the air.
But I do agree that it's not worth it going closer just to see Mt Fuji and not least because the visibility is not guaranteed. I've been on the slope of Fuji in dense enough fog that I couldn't see my feet so I guess that counts as case when you cannot see it on its slopes. But of course there are other things to do and see near Fuji.